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Related Experiment Video

Updated: Jul 6, 2025

Using an Ingestible Telemetric Temperature Pill to Assess Gastrointestinal Temperature During Exercise
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Gastrointestinal function following endurance exercise under different environmental temperatures.

Daichi Sumi1,2,3, Kazunobu Okazaki2, Kazushige Goto4

  • 1Institute of Sport Science, ASICS Corporation, Kobe, Japan.

European Journal of Applied Physiology
|January 3, 2024
PubMed
Summary
This summary is machine-generated.

Endurance exercise in hot environments significantly worsens gastrointestinal (GI) damage and gastric emptying (GE) compared to thermoneutral or cold conditions. Cold and thermoneutral environments show similar effects on GI function during exercise.

Keywords:
Cold stressEndurance exerciseGastric emptying rateGastrointestinal damageHeat stress

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Area of Science:

  • Exercise Physiology
  • Environmental Physiology
  • Gastrointestinal Physiology

Background:

  • Environmental temperature significantly influences physiological responses during exercise.
  • Understanding the impact of heat and cold on gastrointestinal function is crucial for athletes and active individuals.

Purpose of the Study:

  • To investigate the effects of different environmental temperatures on exercise-induced gastrointestinal damage.
  • To assess the impact of environmental temperature on gastric emptying (GE) rate during endurance exercise.

Main Methods:

  • Eleven trained males underwent high-intensity interval endurance exercise in three conditions: thermoneutral (23°C), hot (35°C), and cold (10°C).
  • Blood intestinal fatty acid binding protein (I-FABP) levels were measured pre- and post-exercise to indicate GI damage.
  • Gastric emptying (GE) rate was evaluated by measuring Tmax, the time to reach maximum 13C-excretion/h post-exercise.

Main Results:

  • Rectal temperature was significantly higher in the hot trial compared to thermoneutral and cold trials.
  • Plasma I-FABP levels, indicating GI damage, were significantly elevated in the hot trial versus thermoneutral and cold trials.
  • Gastric emptying (GE) rate was significantly delayed in the hot environment compared to thermoneutral and cold conditions.

Conclusions:

  • Exercise in hot environments exacerbates gastrointestinal (GI) dysfunction, including damage and delayed gastric emptying.
  • GI function during endurance exercise is comparable between thermoneutral and cold environments.
  • Environmental temperature is a critical factor affecting GI response to exercise.